Chapter 6. Materials Around Us
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NCERT Class 6 Science (Curiosity) Chapter 6 Materials Around Us
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NCERT Class 6 Science (Curiosity) Chapter 6 Materials Around Us
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NCERT Class 6 Science (Curiosity) Chapter 6 Materials Around Us
Question 1. Would it be a good idea to use paper-like materials for making cooking utensils? (Page 104)
Answer:
No. Paper-like materials are not suitable for making cooking utensils. Such materials cannot withstand high temperature of the flame and may burn. The liquid contents of the food will also soak the paper.
Question 2.
Are all lustrous materials metals? (Page 107)
Answer:
All lustrous materials may not be metals. Somei materials can be made lustrous by polishing or coating them with a thin layer of plastic, wax or any other material which makes them look shiny.
Question 3.
Is water transparent? Can it be made opaque? (Page 110)
Answer:
Pure water is transparent. It can be made opaque by adding some other materials to it. For example, muddy water is opaque.
Question 4.
Does everything you put in water disappear? (Page 111)
Answer:
No. Everything we put in water does not disappear. Only the materials which are soluble in water disappear when mixed with water in limited amount.
Question 5.
Are there any properties which can be shown by all materials? If yes, what are those? (Page 115)
Answer:
Yes, there are some properties which are shown by all materials. All material objects possess mass and occupy space.
Let Us Enhance Our Learning (pages 119-121)
Question 1.
Visit your kitchen and observe how your parents have organised various edibles. Can you suggest a better sorting method? Write it in your notebook.
Answer:
Pulses such as moong dal, chana dal, urad dal, arhar dal, etc., should be grouped together. Cereals such as rice, dalia, wheat flour, maize flour, etc., should be grouped together.
Spices such as red chilli powder, salt, clove, black pepper, ajwain, cumin (jeera), coriander seeds (dhaniya), turmeric powder, garam masala etc., should be grouped together.
Cooking oils and ghee such as mustard oil, soyabean oil, olive oil, cow ghee, etc., should be grouped together.
Jams and squashes should be placed together.
Question 2.
Unscramble the letters (Column I) and match with their properties (Column II).
| Column I | Column II |
| (i) MATTER | (b) Occupies space and has mass. |
| (ii) SOLUBLE | (d) Mixes completely in water. |
| (iii) TRANSPARENT | (a) Objects can be seen clearly through it. |
| (iv) LUSTRE | (c) Shiny surface. |
Question 3.
The containers which are used to store materials in shops and at home are usually transparent. Give your reasons for this.
Answer:
The containers which are used to store materials in shops and at home are usually transparent so that the materials stored in them can be seen through them and can be found easily.
Question 4.
State whether the statements given below are True [T] or False [F], Correct the False statements).
(i) Wood is translucent while glass is opaque.
Answer:
False
Wood is opaque while glass is transparent.
(ii) Aluminium foil has lustre while an eraser does not.
Answer:
True
(iii) Sugar dissolves in water whereas sawdust does not.
Answer:
True
(iv) An apple is a matter because it occupies no space and has mass.
Answer:
False
An apple is a matter because it occupies space and has mass.
Question 5.
We see chairs made up of various materials, such as wood, iron, plastic, bamboo, cement and stones. Following are some desirable properties of materials which can be used to make chairs. Which materials used to make chairs fulfill these properties the most?
(i) Hardness (does not bend or shake on sitting even after long use).
(ii) Lightweight (easy to lift or to take from one place to another).
(iii) Does not feel very cold when sitting during winters.
(iv) Can be cleaned regularly and made to look new even after long use.
Answer:
(i) Iron, cement and stones
(ii) Plastic and bamboo
(in) Wood and bamboo
(iv) Plastic, iron, cement and stones
Question 6.
You need to have containers for collection of (i) food waste, (ii) broken glass and (iii) wastepaper. Which materials will you choose for containers of these types of waste? What properties of materials do you need to think of?
Answer:
We can use plastic containers for collection of (i) food waste (ii) broken glass and (iii) waste paper. These containers may have different colours because food waste is biodegradable, broken glass is hazardous and waste paper is recyclable. In case of food waste, the material of the container should not react with food and should be leak proof. For broken glass the material of the container should be hard so that glass should not cut it. For storing waste paper the material of the container should be light and strong.
Question 7.
Air is all around us but does not hinder u‘s from seeing each other. Whereas, if a wooden door comes in between, we cannot see each other. It is because air is ________ and ________ the wooden door is ______
Choose the most appropriate option:
(i) transparent, opaque
(ii) translucent, transparent
(iii) opaque, translucent
(iv) transparent, translucent
Answer:
(i) transparent, opaque
Question 8.
Imagine you have two mysterious materials, X and Y. When you try to press material X, it feels rigid and does not change its shape easily. On the other hand, material Y easily changes its shapk when you press it. Now, when you mix both materials in water, only material X dissolves completely, while material Y remains unchanged. What can materials X and Y be? Can you identify whether material X is hard or soft? What about material Y? Justify your answer.
Answer:
X can be sugar crystal and Y can be rubber block.
The material X is hard.
The material Y is soft.
Question 9.
(i) Who am I? Identify me on the basis of the given properties.
(a) I have lustre.
(b) I can be easily compressed.
(c) I am hard and soluble in water.
(d) You cannot see clearly through me.
(e) I have mass and volume but you cannot see me.
(ii) Make your own Who am I?’
Answer:
(i) (a) steel
(b) rubber
(c) sugar
(d) cardboard or plywood
(e) air
(ii) (a) You can see clearly through me
(b) I am soft
(c) I am non-lustrous
(d) I am liquid and insoluble in water
(e) I cannot be compressed easily.
Question 10.
You are provided with the following materials—vinegar, honey, mustard oil, water, glucose and wheat flour.
Make any two pairs of materials where one material is soluble in the other. Now, make two pairs of materials where one material remains insoluble in the other material.
Answer:
Soluble pairs
(i) Water and glucose
(ii) Water and vinegar
Insoluble pairs
(i) Water and mustard oil
(ii) Water and wheat flour
Activities
Activity 6.1: Let us Identify (Page 102)
Make a list of objects you see around and also write the names of the materials they are made up of in Table
Answer:
Table: Identify materials
| I Observe (Objects) | Materials they are made up of |
| 1. Books | Paper |
| 2. Table | Wood |
| 3. Tumbler | Glass |
| 4. Notebook | Paper |
| 5. Pen | Plastic, metal and ink |
| 6. Pencil | Wood and carbon (graphite) |
| 7. Scale | Plastic |
| 8. Sharpener | Plastic and metal |
| 9. Chair | Wood |
| 10. Shirt | Cloth and plastic (buttons) |
Activity 6.3: Let us think (Page 104)
Let us think what materials we can use to make a tumbler. Fill in the names of the materials in the spaces provided in Fig. 6.2. (See Textbook, Page 104)
Answer:
To study the various materials that can be used to make a tumbler
The material selected for making an object depends on the properties of material and the purpose for which the object is to be used. We may use different materials for making an object. The materials that are required to make a tumbler should be capable of holding water or some other beverage which is put into it. We cannot use cloth for making a tumbler because water would leak through it.
Activity 6.4: Let us Explore (Page 105)
Fig. illustrates a variety of balls that are of the same size but made up of different materials.
Different types of balls used for various purposes
- Take each ball and drop it from a fixed height.
- Note the height to which the ball bounces and record.
- Identify the ball that achieves the highest bounce.
Answer:
To explore the bouncing level of the balls used for various purposes
Balls used for different purposes are made up of different materials. Bouncing levels of these balls are different.
- Take different balls that are of the same size but made up of different materials.
- Take each ball and drop it from a fixed height (about 2 m).
- Observe the height to which the ball bounces and record it.
- Identify the ball that achieves the highest and the lowest bounce.
Table: Bouncing level of the balls
| Ball | Bounce (high, medium or low) |
| Tennis ball | High |
| Cricket ball | Low |
| Hand exercise ball | Medium |
| Any other | Medium |
It is observed that balls made up of different materials bounce back to different levels. The cricket ball has low bouncing level whereas hand exercise ball has high bouncing level. Bouncing level of tennis ball is medium.
It may be concluded that a level to which the ball bounces back depends upon the type of material used for making it.
Activity 6.5: Let us Observe (Page 107)
Hold the objects given in Table 6.3 with your hands. Feel whether the objects are hard or soft. Find out the materials they are made up of. Enter your observations in Table 6.3.
Compare your observations with the observations of your friends and discuss.
Answer:
To study whether the given objects are hard or soft and to find the materials the objects are made up of Materials which can be compressed or scratched easily are classified as soft, while the materials which are difficult to compress or scratch are classified as hard.
Table: Classification of objects as hard or soft and study of materials they are made u of
| Objects | Hard/soft | Materials |
| 1. Brick | Hard | Baked clay |
| 2. Water bottle | Hard | Plastic |
| 3. Pillow | Soft | Cloth and cotton |
| 4. Tumbler | Hard | Glass |
| 5. Table | Hard | Wood |
| 6. Sweater | Soft | Wool |
| 7. Spoon | Hard | Steel |
| 8. Pen | Hard | Plastic, metal and ink |
| 9. Hand exercise ball | Soft | Rubber |
From the above observations it may be concluded that an object may be hard or soft depending on the nature of the material it is made up of.
Activity 6.6: Let us Classify (Page 109)
Classify the following objects as transparent, translucent or opaque in Table.
Answer:
The materials through which the things can be seen clearly are called transparent.
The materials through which we are not able to see at all are called opaque. The materials through which the objects can be seen, but not clearly are called translucent.
Record the results in tabular form.
| Transparent | Translucent | Opaque |
| Glass tumbler | Butter paper | Eraser |
| Window glass | Frosted glass | Wooden board |
Related Searches
- Chapter 1. The Wonderful World of Science
- Chapter 2. Diversity in the Living World
- Chapter 3. Mindful Eating: A Path to a Healthy Body
- Chapter 4. Exploring Magnets
- Chapter 5. Measurement of Length and Motion
- Chapter 6. Materials Around Us
- Chapter 7. Temperature and its Measurement
- Chapter 8. A Journey through States of Water
- Chapter 9. Methods of Separation in Everyday Life
- Chapter 10. Living Creatures: Exploring their Characteristics
- Chapter 11. Nature’s Treasures
- Chapter 12. Beyond Earth
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